What's best for me Membership or Supporter?

I am a bit confused, so I'm hoping someone here can help.

I'm not sure if I just need Membership, or Supporter or both.

This is what I would like to do.

Environment is WPMU + Buddypress

I would like to offer a premium membership where I charge a subscription each month. For this they get:

a) Access to all content
b) Ability to create one blog
c) Ability to create x number of buddypress groups

Free Membership where I do not charge a subscription each month. For this they get:

a) Ability to non-premium content
b) Cannot create blogs
c) Can be members of groups and participate but not create buddypress groups.

Thanks,